Could be the ECU going through relearn after having power removed. If it doesn't straighten out after a few hours of driving, I'd do a visual check for broken exhaust O2 sensors/connectors (apparently they are quite fragile) and hoses/ducts (including the intakes) that may have gotten knocked loose.
Get an OBD scanner and check for any DTCs. Use the scanner to check O2 sensor outputs. Bank 1 sensor 1 and bank 2 sensor 1 should read close to each other. B1 s2/b2 s2 should read close to each other.
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